Plaster board



Sept. 9 .A1 924.

R. c. RIN'GHOLZ PLASTIR BOARD V Origin-1 Filed Aug. 9, 1922 @Qhmvmn.

B Fwd/m? mum .0 device Patented Sept. 9, 1924.

ROBERT 0. RINGHOLZ, OF SALT LAKE C'I'I'Y, UTAH.

PLASTEB BOARD.

Application filed August 9, 1922, Serial No. 580,681. Renewed March 10, 1924.

To all whom it may concern:

Be it known that I, ROBERT C. RmoHoLz, a citizen of the United States, and a resi dent of SaltLalzc City and county, State 6 of Utah, whose address is 349 South 3rd East Street; Salt Lake City, Utah, have invented a new and useful Im rovement in Plaster Boards, of which t e following, taken in connection with the accompanying '1 drawings, is a specification.

'My invention has for its object to provide 's, plaster-board that will be stronger than the ones made of paper and plaster, and also stronger than; one that might be for-med with a, thin sheet of metal, wire netting or the ordinary metal lath.

A further object is to provide a plaster board so reinforced that nails may be driven through any portion of the same without breaking the plaster when fastenat the same time so pressed that the strips cut into the sheet of metal .form curvilinear projections on each side of the metal sheet and form a part of the same, said curvilinear projections being staggered and oocurringon the sheet at approximately right angles to each other throughout the sheet, the curved portion projecting alternately in the on one side and then on the other side of the' sheet of metal, causing the same to act as transverse reinforcements in each of the side sheets of plaster while the'body oi said metal sheet also acts as a re-mforeement between said sheets of plaster. y

'lhesc objects I accomplished the drawings in which similar reference letters indicate similar parts throughout the several views.

In the drawings which I have substantially shown my invention. Figure I is a.

plain view of a fragment of the board with parts out away Figure II is an edgeview of the board showing the protruding portions of the flattened curvilinear projections when'the plaster sheets have been removed;

and Figure III is a plan view of the metal sheet when out and pressed ready't'o receive the coating of plaster on elther side. I My invention consists of the metal sheet A havingaplurality of flattened curviillustrated in the accompanying l projections made thereon by cuttiiig approximately parallel lines and pressin the portion in between said cuts outwardly from one side of the sheet, and pressing the portion between the adjacent two outs to the opposite side of the sheet and staggering t ese projections so that they will be alternately at right angles to each other when considered as in a plane. The purpose of so dis lacin and arranging the metal presse out othe general plane of the sheet is to form arch-like portions of metal alternate'ly, having the arch first on one side and therion the other so as to form an a proximately ovate oblong transverse per oration plane of the metal sheet through which t e plaster may protrude from one side to the other, thus causing the archlike projections to act as lateral and longitudinal re-inforcements in the general plane of the finished sheet.

The erforated sheet A is covered on both si es with plastic plaster B of an desired thickness from an eighth of an inc tosay a quarter of an inch, which plaster when set adheres to the surface of the metal sheet, fills the ovate oblong perfqgations and thus unites the sheet of. aster on one side of the perforated metal slkflwith the sheet of plaster on the other; ids of the metal sheet; the two sheets of plaster thus form ing a com osite whole, re-inforced throughout latera y and longitudinally with alternate convex and concave 2 strips of metal, thus making a very strong plaster-board for its size an weight. The plaster B is mariner-calcined gypsum or any other material'which may be applied in a plastic conanion and which will set and harden.

In my drawing I have shown the metal cut into .sti'ips, forming ap roxjmately a Roman arch: It will be on erstood, however, that these strips may be pressed so as to form a Gothic arch, or so to form an acute or obtuse angle with St ight sides )pvithoiil; departing from the s irit of my invention. It will also be un erstood thatthese strips may be cut or-broken at or near the" center, or perforated at or near the center without departing from the spir t of my inventiion: and also, that while I show and claim the recessions and depresalone as being alternately adjacent to each "other, that any other arrangement nay be made, and that all of the depressions or 110 mixtures, magnesite mixtures,

recessions may be arranged so that there will be only projections and no recessions immediately adjacent when viewed from one side of the sheet, and while this arrangement would not make the metal reinforcement as strong as where there are projections on each s de of the sheet, it might be so used where greater strength was not required.

It will also be observed that the drawing shows the metal sheet with or without the edge out or notched, and the cut portions thereof alternately pressed out of the general plane on the re-inforce the edge thereof and reduce the liability of the plaster craclging or chipping when nails are driven through close to the edge. It will be understood that the edges of the metal sheet may be so treated or not as may be desired.

It will also be observed that the perforated metal sheet above described may be used as an ordinary metal lath and that finely .divided concrete mixtures, gypsum Keene cements etc., may be also applied in sheets to either or both sides of my perforated metal sheet and thus form a smooth and finished wall, floor or ceiling.

It will also be seen that the curvilinear projecting and receding strips may be in the same or another operation bent or corrugated, forming V or U shaped corrugations lengthwise or crosswise of the strips without departing from the spirit of my invention, and where greater strength is resheet of metal so as to quired, it will readily be seen that it may be obtained in this way.

It will also be seen that these curvilinear projecting and receding strips may be bent or pressed at an angle to the plane of the sheet without departing from the spirit of my invention.

Having thus described my invention, 1 claim:

1. A plaster-board of the class described comprising a metal sheet, having a plurality of alternately adjacent convex and concave projections and recessions cut and pressed therein, leaving approximately ovate oblong perforations in the cross section of. the sheet and cover sheets of plaster on both sides of said metal sheet filling said perforatioris and uniting said cover sheets of plaster through the said cross-section perforations.

2. A plaster-board comprising a thin metal sheet having a plurality of alternate adjacent curvilinear projections anddepressions cut and pressed therein, staggered in relation to each other so that a portion of the projections and recessions are at right angles to each other, said adjacent recessions and projections forming numerous perforations in the lateral and longitudinal plan of the metal sheet, a sheet of plaster covering the said metal sheet and surrounding the said curvilinear projections and filling the said curvilinear recessions and depressions and adhering to the metal sheet and rurvilinear projections and recessions.

ROBERT C. RINGHOLZ. 

